package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    /**
     * 新增菜品和对应口味
     * @param dishDTO
     */
    // 事务 两张表操作 菜品 口味表 数据一致性
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();


        List<DishFlavor> flavors=dishDTO.getFlavors();

        if(flavors!=null && flavors.size()>0){

            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
        //
    }

    /**
     * 分页查询菜品
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
       // select * from dish limit 0,10
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        //不适用dish
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);

        long total=page.getTotal();
        List<DishVO> records=page.getResult();

        return new PageResult(total,records);
    }

    /**
     *菜品删除
     * @param ids
     * @return
     */
    //事务注解 保证数据一致性
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断菜品是否能够被删除  起售中？
        for(Long id:ids){
            Dish dish=dishMapper.getByid(id);

            if(dish.getStatus()== StatusConstant.ENABLE){
                //起售 不可删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }

        }

        //菜品被套餐关联
        List<Long> setmealids = setmealDishMapper.getSetmealIdsByDishIds(ids);
        // 不等于 null 确保对象初始化
        if(setmealids != null && setmealids.size()>0){
            //当前菜品被套餐关联  不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //可以删除 删除菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteByid(id);
//            //删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishid(id);
//        }

        //批量删除菜品
        dishMapper.deleteByids(ids);
        dishFlavorMapper.deleteByDishids(ids);
    }

    /**
     * 根据id查询菜品 和对应口味数据
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {

        //先查询菜品
        Dish dish=dishMapper.getByid(id);

        //查询关联口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //封装VO
        DishVO dishVO=new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id 修改菜品和口味
     * @param dishDTO
     * @return
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        //修改菜品表基本信息
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        //删除原有口味数据
        dishFlavorMapper.deleteByDishid(dishDTO.getId());
        //插入新的口味数据
        List<DishFlavor> flavors=dishDTO.getFlavors();

        if(flavors!=null&&flavors.size()>0){

            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }
}
